Idioms and Phrases - Verbal and Reasoning

In the following questions four alternatives are given for the idiom/phraseitalicised and underlinedin the sentence. Choose the alternative which best expresses the meaning of idiom/phrase.
Q1:

He sold his house for a song.

A at a reasonable price

B at a discount

C very cheaply

D at a premium

ANS:C - very cheaply

No answer description is available.